Feels Like My Back's Slipped...

"What the hell, why isn't she reading the messages?"
Her hair was still damp from the shower, and Cha Yu-hyun, sitting on a chair in just her panties, muttered to herself as she stared at the chat room with no replies.
It was still winter, so it should have been cold, but she'd just come back from the gym, showered, and her body heat hadn't faded yet—she hadn't even bothered putting on a top. Normally, her parents would have yelled, Girl, what the hell is that outfit? Put some clothes on right now! But who was she? The model student who'd gotten into her top-choice university on her first try without retaking exams, the dutiful daughter who loved running—Cha Yu-hyun. She'd boldly declared she'd live alone after getting accepted, rented an apartment near campus before classes even started, and moved in. No one was left to nag her about wandering around undressed anymore.
"Mm, did she pass out after drinking last night? We did run a pretty good distance..."
Her breasts weren't as huge as Seo-yoon's or Mari's, but they weren't small either—just the perfect size, jiggling lightly. They weren't so big they'd overflow your hands, but pretty enough to look at, with matching pink nipples. Hers were smaller than her friends', which bugged her a bit since their areolas were about the same size, but at least they weren't inverted like Ga-hyun's—she was grateful for that much.
"Is Ga-hyun resting today too?"
There were two unread marks, so Ga-hyun must have read them. A 'check' emoji was attached to her message, signaling it'd been seen.
"She could afford to take it easy today..."
She sent a few more texts, but the unread count didn't budge, so she set her phone down.
"Nngh..."
She stretched her arms overhead lightly, revealing her perfectly groomed armpits—not a single hair, thanks to diligent maintenance.
"Should I just get laser hair removal?"
She examined her armpits from different angles while holding her arms up, then wiped the lingering sweat from her back with a towel.
"Come to think of it, Seo-yoon said she doesn't shave down there at all..."
She tugged her panties aside for a quick peek at her own pubic hair, her face flushing slightly as she mumbled. It was completely smooth, bald as can be.
"...Maybe having a little is better?"
No hair's more convenient during periods, she thought, then hurriedly got dressed.
* * *
Bzzz, bzzz— The phone on the table vibrated, notifying of unread messages. But its owners were too deep in a sticky tangle of flesh to notice.
"Haa, haaah...!"
"Hah, haat...!"
The room was filled only with the slap-slap-slap of skin on skin and their moans. They'd gasp wildly now and then, on the verge of passing out, and pretty often, squirt, squirt—Seo-yoon would spray her juices. No real words, just that.
"This is Seo-yoon's fault, you're the bad one here!"
"Heeek...♡"
Mari kept pistoning her hips relentlessly at Seo-yoon, sprawled beneath her with glazed eyes and those massive tits shaking. It should have felt awkward with a dick suddenly sprouting overnight, but she'd already graduated from leg-thrusting to proper hip action—boing-boing, bouncing away. Still her first ejaculation of the day, post-orgasm sensitivity lingering, so her movements were clumsy, but it was pure male instinct.
"Ha, haaaah...♡"
Lost in pleasure-fogged bliss, she'd jolt and clamp down every time Mari thrust deep into her pussy with her cock. Mari couldn't figure out why it felt so good, like her pussy was melting the dick—especially since she was the first.
"Haa, haa..."
One moment of laxness, and she'd blow her load deep inside. That warm, snug embrace wrapping her entire shaft—Seo-yoon's pussy was too delicious, heaven and hell in one. She wanted to flood it nonstop with pussy juice and cum, fill her friend to the brim. But the dizzying thought of creampieing raw without a condom snapped her sober. Reason kicked in: Pull out now! But the walls clung greedily, refusing to let go.
In the end, Mari held back as long as she could, savoring this perfect chemistry with her friend for every extra second.
"Th-there...!"
She paused to catch her breath, lifting her hips—and hit a weak spot. Seo-yoon's back arched, quivering violently. Her hands flailed at empty air, then splurt-splurt!—her pussy squirted juices. Mari had stopped counting after the tenth orgasm. The towel under them was soaked through long ago. The sheets would definitely need changing, even if the mattress survived.
"Ngh, hnnngh...♡"
Mari wasn't faring much better. Every time Seo-yoon clenched in climax, she'd grit her teeth and think sad thoughts to endure.
One more time, maybe... Judging she couldn't last longer, Mari resumed her thrusts. If I hadn't blown earlier, I'd have creampied her already. That perfect fit from just the tip in—she smacked her lips remembering.
Wanna cum inside so bad. Her fingers on Seo-yoon's thigh twitched, and Seo-yoon shuddered lightly, grabbing her hand.
"...Getting close...♡"
"...!"
One hand interlaced, the other gripping Seo-yoon's waist—Mari slammed in harder than ever.
"Hrng, hraaat...♡"
Slap-slap-slap— Skin smacked faster and faster. Practically fused as one, they kissed without knowing who started it.

"Mmmph♡"
Hot breaths exchanged, thick strands of saliva dripping. Massive tits squished soft and pillowy, erect nipples tickling each other.
"Grk...!"
Mari couldn't hold back anymore and went into her final sprint. Her cock swelled taut from the root, pressing Seo-yoon's tight pussy from within. The expansion at her entrance—riding atop her, getting fucked senseless, Seo-yoon knew her friend's climax was near.
"Haa, haat...♡"
The swollen shaft ground her clit from below; bellies pressed so tight even externally it stimulated her navel-deep.
"Hek, heeuk, uuk♡"
Insertion orgasm plus clit orgasm—first time feeling both at once, her body trembled uncontrollably. She'd thought pussy pleasure was familiar, but this overwhelming ecstasy exploding in her brain made stars burst before her eyes. Clenching in climax, Mari couldn't hold—ejaculation surged up her shaft as she thrust one last time.
"...!"
"!!!"
As Seo-yoon arched back in orgasm, Mari came too, bucking her hips up. Pop—the thick cock slipped from her pussy, too late to reinsert, and thick semen rained down on Seo-yoon's body.
"Haa, heeeee♡"
Seo-yoon's eyes spun dizzily under the cascade of white cum.
"Hnnngh, uuugh!"
From tits to belly, thighs, legs.

The ejaculation lasted about a minute again before Mari slumped, post-nut clarity hitting like a truck. Seeing Seo-yoon utterly drenched, cum coating every inch, emotions swirled.
I really fucked Seo-yoon.
Face-down on the bed, her pretty pink pussy—still seeking the cock that had been inside—gaped and drooled juices.
"Haa, haa..."
Finally catching her breath, Mari lifted her sore waist and grabbed a towel from the floor. Had to clean her friend first.
"Seo-yoon, you okay?"
Worried at her friend still panting shallowly, unable to rise. Even as an enhancer, Seo-yoon might've struggled with Mari's way-above-average monster cock.
Mari gently wiped her still-burping dick, then Seo-yoon's body from the less-soiled spots. No matter how hard she tried, the massive load left skin slick and sticky.
"Outside..."
"Huh?"
"You came outside..."
Pondering if she should carry her to the bathroom, Mari blinked at Seo-yoon's words.
"Well... where else was I supposed to cum...?"
Secret: In that final buck, cock slipping out into cold empty air, she'd debated shoving back in. But reason post-cum said Good thing it was outside.
But what was Seo-yoon saying?
"...You could've cum inside, y'know."
"..."
Realizing what she'd said, she slapped her own cheek in shock. Cum from her hand smeared her face, but whatever—she'd wash anyway.
"Sh-should we... shower together...?"
Mari pretended she misheard, awkwardly standing.
"M-my back feels slipped out..."
"Huh?"
"Grab my hand..."
Struggling to rise, Seo-yoon turned and reached out. Mari blinked, then burst out laughing and took it.
"Can you stand?"
"...Can you carry me?"
Supporting each other to the bathroom, they came to under the pouring water.
"Haa..."
"Feels like I can live now."
Reason returning, they recalled what they'd just done and silently washed.
"Ack, shampoo in my eyes!"